To setup, run the "setup phone rom", which only takes a few seconds. What this does is make a copy of your boot file in case you screw something up. Once this is done, you can install up to 4 different ROM's on your SD card and then boot into them from this same program.
If something gets screwed up along the way and you cannot boot your phone, boot into CWR, install a zip from a file, and find the update.zip in the bootmanager/phonerom(or whatever ROM folder you want to boot) folder.
Currently I am running MIUI, TSM pool party, TSM gangbang, Skyraider Zues, and newt's 3.0 port.